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EXPLANATION OF THE PLATES. 
Prats XI. APHANTOCHZETA EXILIS.—Pace 100. 
A PLANT OF THE NATURAL SIZE. 
A head of flowers, moderately enlarged. 
Involucre and receptacle, from which the flowers have fallen, more enlarged. 
and 4. Scales of the involucre, equally magnified. 
. A pistillate flower. 
A perfect flow 
anid 
A stamen nified, 
. Summit of the style of a pistillate flower, equally magnified. 
ed. 
Style of a perfect flower, equally magni 
ed 
. An achenium, enlarg 
Prats XI. EVAX CAULESCENS.—Pacex 101. 
A plant of the natural s 
A head of flowers ; eras section, enlarged. 
Involucre and receptacle ; more enlarged. 
Inside view of one of the palew from the summit of the receptacle, 
A male flower. 
A stamen, from the same, 
One of the 209 subtending the female flowers. 
A female flow 
. An achenium ; ne details all magnified. 
Puare XII. LINOSYRIS BIGELOVII.—Pace 98. 
A BRANCH OF THE NATURAL SIZE. 
A flower ; enlarged. 
A stamen ; magnified. 
The bd more magnified. 
um, with its pappus ; enlarged. 
totic: enlarged 
Puare XIU. STYLOCLINE GRAPHALOIDES.—Paae 101. 
A PLANT OF THE NATURAL SIZE. 
Involucre and receptacle. 
re le, with a male flower on its summit, and its subtending palea. 
men. 
res a the fertile — enclosed in its large palea. 
Dorsal view of a fert 
—— view of rae: same. 
A fertile flowe 
An achenium ; ibs details variously magnified, 
Pirate XIV. QUERCUS ECHINACEA.—Pace 137. 
A BRANCH OF THE NATURAL SIZE. 
A leaf without serratur 
. An acorn ; both hia, oe the natural size. 
Prare XV. SYNTRICHOPAPPUS FREMONTII.—Pace 106. 
AN ENTIRE PLANT OF THE NATURAL SIZE. 
Involucre and aga sree 
fi 
A separate stamen. 
Style and its branc 
. Portion of the syle pappus. 
. One of the leaves of the same; highly magnified. 
[165] 109 
erse section of the same ; to show the way in which the achenium is enclosed in a dorsal fold of the palea. 
